Hi.  We're new to the list ... own a 1974 Montgomery 17 that has been restored and has some improvements.  I noted the item about filling tanks on small motors:  Briggs and Stratton makes [or made] a one gallon can with a patented fill tube that shut off automatically when the receiving tank was full.  No muss .. no fuss .. no bother.  I think they are still available at good lawnmower shops etc.